A magnitude 4.2 earthquake erupted beneath the seafloor about 47 miles southwest of San Clemente at 6 p.m., producing brief shaking that was lightly felt from one end of Orange County to the other, the U.S. Geological Survey says. The quake, which began an unusually 24 miles deep, occurred between the San Clemente and San Diego trough fault systems. But the specific fault that produced the shaker has yet to be identified. The earthquake also was widely felt across Camp Pendleton, south of Orange County, and in Oceanside, even further south.

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